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Discussion Starter · #1 ·
I am considering purchasing the brembo gran turismo front brake kit from a friend for a really good price. My issue is that with the larger rotor he has, and the caliper bracket, the bracket bolts hit the inner barrel of my wheel. I have two options. First, is to machine down the outer radius of the bolt to give clearance, or have a custom set of bolts made with domed heads to clear the barrel. Can anyone offer any advice on this dilemma. Also, how can I find out the exact specs from brembo to send to a custom bolt manufacturer? Your help is greatly appreciated.

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The other option is to use wheels that fit those brakes. Or pass on a "good," deal that isn't really a deal based on the effort involved... Ever heard the saying there is no such thing as a free puppy?

The GT brakes are no joke when it comes to needing the right wheel size.
 

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Discussion Starter · #3 ·
The other option is to use wheels that fit those brakes. Or pass on a "good," deal that isn't really a deal based on the effort involved... Ever heard the saying there is no such thing as a free puppy?

The GT brakes are no joke when it comes to needing the right wheel size.
I can see your point, but other than spending a few dollars on the bolt clearance, what is the problem with running them with my current 19" setup? I literally need a 1-2 mm of clearance on the upper bracket bolt.

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Typically the bolt head has the info you need in terms of grade strength e.g. grade 8, 8.8, etc.

Then you just need to know the bolt length and thread pitch. From there, I would search McMaster Carr for a proper bolt, or I usually go to my local Tacoma Screw, I'm there there are similar screw specialty shops in your area.
 

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Discussion Starter · #5 ·
Typically the bolt head has the info you need in terms of grade strength e.g. grade 8, 8.8, etc.

Then you just need to know the bolt length and thread pitch. From there, I would search McMaster Carr for a proper bolt, or I usually go to my local Tacoma Screw, I'm there there are similar screw specialty shops in your area.
Thanks for the info. Now, is there any drawback to having the head machined? Not the center, but rather having the edges rounded on the bolt head.

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Thanks for the info. Now, is there any drawback to having the head machined? Not the center, but rather having the edges rounded on the bolt head.

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I would never intentionally round a bolt head for clearancing. That's a recipe for disaster when you want to remove said bolt, or apply any meaningful torque spec on said bolt...

Instead, perhaps look at sourcing a fancy bolt with a torx head or 12-point bolt like those found on german cars, and their damn special niche tools.
https://www.mcmaster.com/#12-point-screws/=172h059
https://www.mcmaster.com/#standard-socket-head-screws/=172h0s4
https://www.mcmaster.com/#standard-socket-head-screws/=172h199
https://www.mcmaster.com/#standard-socket-head-screws/=172h2la
(There are metric equivalents, I just didn't link them, but they exist)

Find the bolt length, thread pitch. You can take your existing bolt head measurement and compare to some of the examples I've linked above.

*Disclaimer* Please buy the proper bolt with the the same grade strength and corrosion resistance applicable to your usecase. This is your life on the line...
 

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Discussion Starter · #7 ·
I would never intentionally round a bolt head for clearancing. That's a recipe for disaster when you want to remove said bolt, or apply any meaningful torque spec on said bolt...

Instead, perhaps look at sourcing a fancy bolt with a torx head or 12-point bolt like those found on german cars, and their damn special niche tools.
https://www.mcmaster.com/#12-point-screws/=172h059
https://www.mcmaster.com/#standard-socket-head-screws/=172h0s4
https://www.mcmaster.com/#standard-socket-head-screws/=172h199
https://www.mcmaster.com/#standard-socket-head-screws/=172h2la
(There are metric equivalents, I just didn't link them, but they exist)

Find the bolt length, thread pitch. You can take your existing bolt head measurement and compare to some of the examples I've linked above.

*Disclaimer* Please buy the proper bolt with the the same grade strength and corrosion resistance applicable to your usecase. This is your life on the line...
So, I should put German parts on my Italian parts? Isn't there some fundamental flaw in that? Lol... seriously, I appreciate your time and assistance. The best part of this is that he will help me test for this before purchasing it, so I can make sure it works.

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So, I should put German parts on my Italian parts? Isn't there some fundamental flaw in that? Lol... seriously, I appreciate your time and assistance. The best part of this is that he will help me test for this before purchasing it, so I can make sure it works.

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Its all EU. it works
 
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